From ab729d36c4ed4f25f2f688048a128784935ba3fe Mon Sep 17 00:00:00 2001
From: Linas Vepstas <linas@austin.ibm.com>
Date: Fri, 3 Feb 2006 16:52:42 -0600
Subject: [PATCH] --- yaml --- r: 22521 b: refs/heads/master c:
 f8a88b19b9d4f59bd625b4852c1b1138a5cf89f3 h: refs/heads/master i:   22519:
 0b56db35f33568038caee7a70825802122a52ea3 v: v3

---
 [refs]                   |   2 +-
 trunk/drivers/scsi/ipr.c | 109 +++++++++++++++++++++++++++++++++++++++
 2 files changed, 110 insertions(+), 1 deletion(-)

diff --git a/[refs] b/[refs]
index 75cec11becc5..65f59c8ffd62 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 4f8d98abaf957691f9543b9b1b610d49aa0f662b
+refs/heads/master: f8a88b19b9d4f59bd625b4852c1b1138a5cf89f3
diff --git a/trunk/drivers/scsi/ipr.c b/trunk/drivers/scsi/ipr.c
index 2bba5e55d7bc..5890e5f92d82 100644
--- a/trunk/drivers/scsi/ipr.c
+++ b/trunk/drivers/scsi/ipr.c
@@ -5830,6 +5830,109 @@ static void ipr_initiate_ioa_reset(struct ipr_ioa_cfg *ioa_cfg,
 				shutdown_type);
 }
 
+/**
+ * ipr_reset_freeze - Hold off all I/O activity
+ * @ipr_cmd:	ipr command struct
+ *
+ * Description: If the PCI slot is frozen, hold off all I/O
+ * activity; then, as soon as the slot is available again,
+ * initiate an adapter reset.
+ */
+static int ipr_reset_freeze(struct ipr_cmnd *ipr_cmd)
+{
+	/* Disallow new interrupts, avoid loop */
+	ipr_cmd->ioa_cfg->allow_interrupts = 0;
+	list_add_tail(&ipr_cmd->queue, &ipr_cmd->ioa_cfg->pending_q);
+	ipr_cmd->done = ipr_reset_ioa_job;
+	return IPR_RC_JOB_RETURN;
+}
+
+/**
+ * ipr_pci_frozen - Called when slot has experienced a PCI bus error.
+ * @pdev:	PCI device struct
+ *
+ * Description: This routine is called to tell us that the PCI bus
+ * is down. Can't do anything here, except put the device driver
+ * into a holding pattern, waiting for the PCI bus to come back.
+ */
+static void ipr_pci_frozen(struct pci_dev *pdev)
+{
+	unsigned long flags = 0;
+	struct ipr_ioa_cfg *ioa_cfg = pci_get_drvdata(pdev);
+
+	spin_lock_irqsave(ioa_cfg->host->host_lock, flags);
+	_ipr_initiate_ioa_reset(ioa_cfg, ipr_reset_freeze, IPR_SHUTDOWN_NONE);
+	spin_unlock_irqrestore(ioa_cfg->host->host_lock, flags);
+}
+
+/**
+ * ipr_pci_slot_reset - Called when PCI slot has been reset.
+ * @pdev:	PCI device struct
+ *
+ * Description: This routine is called by the pci error recovery
+ * code after the PCI slot has been reset, just before we
+ * should resume normal operations.
+ */
+static pci_ers_result_t ipr_pci_slot_reset(struct pci_dev *pdev)
+{
+	unsigned long flags = 0;
+	struct ipr_ioa_cfg *ioa_cfg = pci_get_drvdata(pdev);
+
+	spin_lock_irqsave(ioa_cfg->host->host_lock, flags);
+	_ipr_initiate_ioa_reset(ioa_cfg, ipr_reset_restore_cfg_space,
+	                                 IPR_SHUTDOWN_NONE);
+	spin_unlock_irqrestore(ioa_cfg->host->host_lock, flags);
+	return PCI_ERS_RESULT_RECOVERED;
+}
+
+/**
+ * ipr_pci_perm_failure - Called when PCI slot is dead for good.
+ * @pdev:	PCI device struct
+ *
+ * Description: This routine is called when the PCI bus has
+ * permanently failed.
+ */
+static void ipr_pci_perm_failure(struct pci_dev *pdev)
+{
+	unsigned long flags = 0;
+	struct ipr_ioa_cfg *ioa_cfg = pci_get_drvdata(pdev);
+
+	spin_lock_irqsave(ioa_cfg->host->host_lock, flags);
+	if (ioa_cfg->sdt_state == WAIT_FOR_DUMP)
+		ioa_cfg->sdt_state = ABORT_DUMP;
+	ioa_cfg->reset_retries = IPR_NUM_RESET_RELOAD_RETRIES;
+	ioa_cfg->in_ioa_bringdown = 1;
+	ipr_initiate_ioa_reset(ioa_cfg, IPR_SHUTDOWN_NONE);
+	spin_unlock_irqrestore(ioa_cfg->host->host_lock, flags);
+}
+
+/**
+ * ipr_pci_error_detected - Called when a PCI error is detected.
+ * @pdev:	PCI device struct
+ * @state:	PCI channel state
+ *
+ * Description: Called when a PCI error is detected.
+ *
+ * Return value:
+ * 	PCI_ERS_RESULT_NEED_RESET or PCI_ERS_RESULT_DISCONNECT
+ */
+static pci_ers_result_t ipr_pci_error_detected(struct pci_dev *pdev,
+					       pci_channel_state_t state)
+{
+	switch (state) {
+	case pci_channel_io_frozen:
+		ipr_pci_frozen(pdev);
+		return PCI_ERS_RESULT_NEED_RESET;
+	case pci_channel_io_perm_failure:
+		ipr_pci_perm_failure(pdev);
+		return PCI_ERS_RESULT_DISCONNECT;
+		break;
+	default:
+		break;
+	}
+	return PCI_ERS_RESULT_NEED_RESET;
+}
+
 /**
  * ipr_probe_ioa_part2 - Initializes IOAs found in ipr_probe_ioa(..)
  * @ioa_cfg:	ioa cfg struct
@@ -6601,12 +6704,18 @@ static struct pci_device_id ipr_pci_table[] __devinitdata = {
 };
 MODULE_DEVICE_TABLE(pci, ipr_pci_table);
 
+static struct pci_error_handlers ipr_err_handler = {
+	.error_detected = ipr_pci_error_detected,
+	.slot_reset = ipr_pci_slot_reset,
+};
+
 static struct pci_driver ipr_driver = {
 	.name = IPR_NAME,
 	.id_table = ipr_pci_table,
 	.probe = ipr_probe,
 	.remove = ipr_remove,
 	.shutdown = ipr_shutdown,
+	.err_handler = &ipr_err_handler,
 };
 
 /**